Fused Silica Thermocouple Protection Tubes
Fused silica thermocouple protection tubes are unworked protective tubes for thermocouples in high-temperature environments. Made from pure fused quartz, they withstand molten glass contact without devitrification. These tubes fall under 7002.31.00 as unworked tubes of fused quartz.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the tubes are imported as parts of thermometers or pyrometers
Thermometers and pyrometers fall under heading 90.25, which may apply if the tubes are specifically designed for use with such instruments.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Ensure the tubes are unworked and not fitted with thermocouple wires or connectors
• Verify the fused quartz composition and high-temperature properties
• If the tubes are imported with thermocouples, consider whether they should be classified as parts of thermocouples
Related Products under Tariff item 7002.31.00
Fused Quartz Optical Fiber Drawing Tubes
Fused quartz optical fiber drawing tubes are precision unworked tubes made of fused silica, used in the production of optical fibers. Their high clarity and low impurity levels are essential for maintaining signal integrity during fiber drawing. They fall under tariff item 7002.31.00 as unworked tubes of fused quartz or other fused silica.
Fused Quartz Semiconductor Processing Tubes
Fused quartz semiconductor processing tubes are long, unworked tubes used in diffusion furnaces and CVD reactors. Their extreme purity prevents contamination during high-temperature wafer processing. These tubes are classified under 7002.31.00 as unworked tubes of fused quartz.
Fused Quartz Solar Simulator Tubes
Fused quartz solar simulator tubes are unworked fused silica tubes used as test chambers for photovoltaic cell evaluation. They maintain high solar transmission down to 200nm due to their purity. These tubes fall under 7002.31.00 as unworked tubes of fused quartz.
Fused Quartz Tubing for Laboratory Reactors
Fused quartz tubing for laboratory reactors consists of unworked tubes made from fused quartz or fused silica, supplied in straight lengths without further processing. These tubes are essential components in laboratory equipment such as reactors. They are classified under 7002.31.00 as unworked tubes of fused quartz.
Fused Silica Capillary Tubes
Fused silica capillary tubes are thin-walled, unworked tubes used in gas chromatography and analytical instruments. They maintain optical clarity and purity essential for precise measurements. These tubes fall under 7002.31.00 as unworked tubes of fused quartz.
Fused Silica Investment Casting Shell Tubes
Fused silica investment casting shell tubes are unworked fused quartz tubes used as drain and vent lines in ceramic shell investment casting molds. Their high-temperature stability prevents shell cracking during casting. These tubes are classified under 7002.31.00 as unworked tubes of fused quartz.